摘要
选取大清河水系的4个典型子流域为研究对象,运用滑动平均和M-K检验分析了1956～2005年的年径流系数变化趋势和突变特点。分别运用降雨径流相关法和多元线性回归法分析了气候和下垫面要素对年径流系数的影响程度。结果表明,降雨因素是径流系数变化的主导因素,同时下垫面要素中的草地、耕地和建设用地对径流系数的变化具有一定的影响。这使大清河流域的水资源和水生态环境将承受更大的压力,也是其下游的白洋淀的入淀水量减少的主要原因。
Taking four typical sub-basins of Daqinghe River System as study cases,the variation trend of the annual runoff coefficient and its sudden change features of the basin within a period from 1965~2005 are analyzed with the method of moving-average and M-K test.Furthermore,the impacts from the climate and the underlying surface key elements are also analyzed with the rainfall-runoff correlation method and multivariate linear regression method.The results show that the rainfall is just the dominant factor of variation of the annual runoff coefficient,while the elements of grass land,cultivated land,land for construction,etc.within the key elements of the underlying surface have certain impacts on the variation of the runoff coefficient.This not only exerts more pressure on water resources and water eco-environment of the Daqinghe River Basin,but also is the main causation of the decrease of the inflow to Lake Baiyangdian.
出处
《水利水电技术》
CSCD
北大核心
2012年第6期1-4,共4页
Water Resources and Hydropower Engineering
基金
国家自然科学基金(50879051)
水利部公益性行业科研专项(200901028)
关键词
径流系数
影响因素
变化趋势
大清河流域
runoff coefficient
impact factor
variation trend
Daqinghe River Basin
